* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
} 
body {
	width: 100vw;
	height: 100vh; 
    background-color: black;
	overflow: hidden; 
} 

#app { 
	width: 762px;
	height: 496px;
    margin: 120px auto 0;
    background-color: blueviolet;
	border-radius: 5px;
}   
.textPanel {
	width: 339px;
    height: 101px;
    line-height: 101px;
    margin: 0 auto;
    position: relative;
    text-align: center; 
    color: white;
    letter-spacing: 2px;
    font-size: 30px;
    font-weight: bold;
} 
.panel {
	background: url("../images/panel-bg.png") no-repeat center top;
	width: 641px;
    height: 300px;
    margin: 0 auto;
    position: relative; 
} 
.range {
    width: 615px;
    height: 271px;
    overflow: hidden;
    margin: 0 auto;
    position: relative;
    top: 14px; 
} 
.range::before {
    position: absolute;
    display: block;
    content: "";
    background: url('../images/panel-front.png') no-repeat center top;
    width: 613px;
    height: 271px;
    top: 0;
    left: 1px;
    z-index: 1;
}
.bar {
	list-style: none;
	position: relative;
	float: left;
}
.bar li {
    padding: 0;
    box-sizing: border-box;
    width: 203px;
    height: 271px;
    margin: 0 1px;
}
.startBtn {
    width: 150px;
    height: 40px;
    line-height: 40px;
    border-radius: 10px;
    text-align: center;
    color: white;
    background-color: red; 
    margin: 26px auto; 
}
.startBtn:hover {
    cursor: pointer;
}
.startBtn:active {
    cursor: pointer;
    background-color: darkred; 
}

.fireworks{
    position: absolute; 
    transform: scale(0); 
    z-index: -1;
}

.f1 { 
    top: -20px;
    left: 10%;
    animation: fireworks 3s 0.5s;
}
.f2 { 
    top: -10px;
    right: 10%;
    animation: fireworks 3s 0.25s;
}
.f3 {
    left: 30%;
    top: -150px;
    animation: fireworks 3s;
}

@keyframes fireworks {
    0%{
        transform: scale(0);
    }
    80%{
        transform: scale(1);
    }
    100%{
        opacity: 0;
    }
} 